Note: To invite teachers using Google Groups, you don't have to be the owner of the group, but you do have to be a member. Usually, as a member of the group, you can view the list of members. If you can't view the list, contact the group owner to change the permissions. Learn more about Troubleshooting Invitations.

G Suite for Education accounts

For teachers with a G Suite for Education account, Classroom has the following size limitations for each class:

Maximum number of teachers: 20

Maximum number of members (teachers and students): 1,000

Note: Classroom uses Google Groups for all students and teachers with G Suite for Education accounts. Each person can only be in a certain number of groups. See the Membership section of Groups policies and limits for details.

Personal Google Accounts

Teachers with a personal Google Account also have additional limits on activity, such as creating classes or inviting students. Learn more about Policies and limits.